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Hi all, who knows a way to cancell a command via reactors Here is my code of traping event of starting commands. I want to prevent AutoCAD of continuing some commands, with no success: (VLR-Command-Reactor nil (list (cons :VLR-commandWillStart 'Reactor:commandWillStart ) ) ) (defun Reactor:commandWillStart (-calling-reactor- -info- / *cmdname*) (setq *cmdname* (read (car -info-))) (cond ((member *cmdname* '(STYLE DIMSTYLE DDIM )) [color=red][b](command); it doesn't work [/b][/color] ) (T (mapcar 'princ (list *cmdname* " will start."))) ) ) Any suggestion will be greatly appreciated